AAT1110-S-T データシートの表示（PDF） - Analog Technology Inc

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AAT1110-S-T

ONE-CHANNEL STEP-DOWN PWM CONTROLLER

Analog Technology Inc 

Advanced Analog Technology, Inc.

AAT1110

How to Set the Time Constant for Soft-Start and Short Circuit Protection

1. Soft-Start

At power on, the AAT1110 operates in soft-start mode. The capacitor CSCP connected to SCP pin starts

charging at a constant current. In the soft-start mode, the voltage at SCP pin ( VSCP ) is input to the PWM

comparator, so that the ON duty of the OUT pin is controlled by the VSCP . At completion of the soft-start

operation, the voltage at the SCP pin stays low; the input from soft-start circuit to the PWM comparator

stays high, and enters the short circuit protection waiting state.

Soft-Start Time

ts (sec) ~ 0.84 × CSCP (µF)

2. Short Circuit Protection

If the switching regulator output suddenly drops due to loading effect, the error amplifier output will be

fixed at VOM+ and capacitor CSCP will start charging. When the voltage at the SCP pin reaches

approximately 1.26V, the output pin will set low and SCP pin will remain low.

Once the protection circuit starts operating, the circuit can be recovered by setting the power supply.

Short Circuit Detection Time

t scp (sec) ~ 0.84 × CSCP (µF)

– 台灣類比科技股份有限公司 –

– Advanced Analog Technology, Inc. –

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